GRB 060505

GRB 060505 was a 4-second May 2006 long gamma-ray burst (LGRB). It stimulated research and analysis because such LGRBs are theorized to be generated by core collapse supernovae, and though a host galaxy was discovered (2dFGRS S173Z112, with redshift 0.089), it had no such supernova. Among the possibilities considered is the GRB came from core collapse that did not produce a supernova, or that the GRB was from somewhere far beyond the galaxy.

GRB 060505 is classified as a LGRB, being more than 2 seconds in length. However, LGRBs average around 30 seconds, making GRB 060505 a short LGRB. The term short gamma-ray burst (SGRB) is used for GRBs of less than 2 seconds.